GCSE Physics - Nuclear Fission #38

The video explains nuclear fission, where large unstable nuclei split into smaller ones, releasing energy. Fission can occur spontaneously or be induced by neutrons, with the latter used in reactors. The process involves firing a neutron at uranium 235, causing it to split and release energy and more neutrons, leading to a chain reaction. This reaction must be controlled in reactors to prevent disasters. The video also discusses the pros and cons of nuclear energy, highlighting its cost-effectiveness and clean energy production, but also the risks and waste management challenges.

What is the primary method used to initiate nuclear fission in reactors?

• Exposure to sunlight

• Application of heat

• Spontaneous fission

• Absorption of a neutron

In the nuclear fission process, what is released along with daughter nuclei?

• Protons

• Alpha particles

• Electrons

• Neutrons and gamma radiation

What is a key characteristic of a nuclear fission chain reaction?

• It requires constant external energy

• It can trigger more fission reactions

• It stops after one cycle

• It only occurs in laboratories

How is the rate of fission controlled in nuclear reactors?

• By increasing the temperature

• Using control rods to absorb neutrons

• By adding more uranium

• By reducing the water supply

What is a disadvantage of nuclear energy?

• It produces a lot of greenhouse gases

• It is a renewable energy source

• Nuclear waste is difficult to manage

• Nuclear power plants are cheap to build